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Goodwill (Tables)
12 Months Ended
Dec. 31, 2012
Goodwill [Abstract]  
Schedule of Goodwill
Goodwill by segment is as follows (in thousands):

 
December 31,
 
2012
 
2011
Electric
$
241,100

 
$
241,100

Natural gas
114,028

 
114,028

 
$
355,128

 
$
355,128